Gray/Dark spots on seedlings (first fan leaves) in high pressure aeroponic grow.

This is only appearing on one of the plants, currently. The roots look good compared with most of what I've seen floating around the web. The plant located clockwise to it is the same strain (Super Bud) which I got in the same pack and it's not having any problems (yet).

The other plant which has grown larger, faster is a Cookies 'n Kush hybrid.

They're about 2 weeks since germination and have been in the aero environment for about 8 days now.


This my first indoor grow. Located in my basement where the relative humidity is currently measured around 35%. These 4 LED strips are EB2's pulling about 40 watts.

Lighting is about 18 on, 6 off but I am planning to switch to 24/0 soon since I want to be taking clones from these plants and don't want them getting any ideas. :weed:

Air temperature is a constant 70 degrees.

They are being misted for half a second, every 60 seconds with lights on. 100 seconds with lights off. Each half-second mist delivers ~1.3mL of nutrient solution which I mixed myself using the HydroBuddy app. Very low NH4+ and plenty of Ca/K & micros.

Nutrient EC: ~1325
EC in runoff: ~1250

Runoff is used to water house plants/veggies upstairs so pH is a non-issue. 5.5 all around.

Not sure what the deal is with these spots. I noticed them last night and they seem to have grown a bit since then. The lights were about 2-3 inches away from the plants but I moved them up a few inches this morning although this doesn't look like anything I've seen under searches for "light burn."

I started them in 1" gro-dan rockwool cubes and they got a little bit of a "mildew" odor like if you left some towels in the washer for a couple days on accident.

Been searching all day but nothing really popped out at me. :confused:

I might lower the EC a bit when I reload the tank tomorrow, but I just dunno. Thanks for looking!
 
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